I don’t think we are going to become extinct. We are very clever and very resourceful.

When I'm good, I'm very good, but when I'm bad, I'm better.

Do not go where the path may lead, go instead where there is no path and leave a trail.

The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.

March on. Do not tarry. To go forward is to move toward perfection. March on, and fear not the thorns, or the sharp stones on life's path.

A thing worth having is a thing worth cheating for.

Human dignity consists in the role we must play in our own perfection. Taking a role in our own self-completion is the highest expression of our creativity.

The deeds you do may be the only sermon some persons will hear today.

Don't hit at all if it is honorably possible to avoid hitting; but never hit soft!

Neither seek nor avoid, take what comes.

The way I see it, if you want the rainbow, you gotta put up with the rain.

Others have seen what is and asked why. I have seen what could be and asked why not.

However many holy words you read, however many you speak, what good will they do you if you do not act on upon them?

One person with a belief is equal to a force of ninety-nine who have only interests.

Aim for the highest.

The only way of discovering the limits of the possible is to venture a little way past them into the impossible.

Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently. You can practice any virtue erratically, but nothing consistently without courage.

If my mind can conceive it, and my heart can believe it - then I can achieve it.

Winning isn't everything but wanting to win is.

Never look back unless you are planning to go that way.

I do not want to die rusting, I prefer to burn out.